Update copyright script for 2019

scripts/maint/updateCopyright.pl

 #!/usr/bin/perl -i -w -p
 
-$NEWYEAR=2018;
+$NEWYEAR=2019;
 
-s/Copyright(.*) (201[^8]), The Tor Project/Copyright$1 $2-${NEWYEAR}, The Tor Project/;
+s/Copyright(.*) (201[^9]), The Tor Project/Copyright$1 $2-${NEWYEAR}, The Tor Project/;
 
 s/Copyright(.*)-(20..), The Tor Project/Copyright$1-${NEWYEAR}, The Tor Project/;